Soon after the end of World War Two, Australia opened its doors to much-needed immigrants (white, of course, having regard to the prevailing White Australia policy). Offered equal opportunity, which was underpinned by the fabled ‘fair-go’ ethos of the Australian working class, non-English speaking immigrants from Europe had good reason to learn English as quickly as possible, and to fit into their nation of choice.
Apart from some Australians of a superior colonial mien, who had forgotten that their land had been acquired from black indigenes by invasion, not by invitation, the foreigners were initially tolerated, then embraced; their offspring reportedly have done better in life (because of a superior work ethic?). See my ‘Karma of Culture’ which sets out the issues involved as I see them.
Successful immigrant settlement does involve careful screening and selection. The applicant for migrant or refugee entry has to be seen as capable of adapting successfully to the host nation, and willing to be a coherent part of it, rather than to set up camp and refuse to integrate; there can be no place for tribal superiority in a relatively new nation still finding its feet.
Until recent times, there has been little evidence of the formation of what used to referred to as ghettos. That might be because of the settlement assistance available, the access to equal opportunity processes, and a reciprocity of response by the immigrants recognising that they are not to be cheap fodder for the workforce.